B2 - Cell division Flashcards
1
Q
What is a gene?
A
-Section of DNA that controls a characteristic
2
Q
What is a chromosome?
A
-A collection of genes
3
Q
How many chromosomes does a human cell have?
A
-46 ( 23 pairs )
4
Q
What is the first stage of the cell cycle?
A
- Cell growth,
- DNA replication,
- Amount of internal structures increase
5
Q
What is the second stage of the cell cycle?
A
-Nucleus divides through mitosis
6
Q
What is the third and last stage of the cell cycle?
A
- Cytoplasm and cell membrane divide,
- 2 genetically identical daughter cells are formed
7
Q
What are undifferentiated cells?
A
-Cells that can develop into any type of cell
8
Q
What are embryonic stem cells?
A
-In early embryo all cells are identical
9
Q
What are adult stem cells?
A
- Only found in few places,
- Not as versatile as embryonic,
- Used to replace dead or damaged cells.
10
Q
Is differentiation permanent?
A
-No
11
Q
What is cloning?
A
-Producing a genetically identical offspring
